Interrupt using the same old question, when invoked second time.

[Saisiva123]

Checked other resources

• This is a bug, not a usage question. For questions, please use GitHub Discussions.
• I added a clear and detailed title that summarizes the issue.
• I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
• I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.

Example Code

def ask_user_node(state: LookupState) -> Command[Literal['lookup_node']]:
       
        user_response = interrupt(state['messages'][-1].content) # intead of taking the new message content its taking the old value that it has already shown to the user.

        if user_response:
            return Command(goto='lookup_node',
                           update={'messages': [HumanMessage(content=user_response, name="User_Response")]})

Error Message and Stack Trace (if applicable)

Description

I had a node that has interrupt and this node might be called multiple times, to collect information from the user. When interrupt is invoked for the second time it shows the previous question instead of showing the new question to user.

System Info

python -m langchain_core.sys_info

[vbarda]

This has already been answered here #3072

if you’re still having issues on the latest version of thr library, please provide a https://stackoverflow.com/help/minimal-reproducible-example

[Saisiva123]

@vbarda That's a different one which was raised by me, where interrupt is not actually getting interrupted for the second time.

Now that is working fine. It is getting interrupted for the second time which is good, that has been resolved in #3072 as you said, but here the new issue is that, instead of showing new question/value to the user when interrupted for the second time, its showing the same old value to the user.

Ideal scenario should be, when the interrupt invoked for the second time, it should show the new/updated question to the user instead of still showing the old question, what do you think?

[vbarda]

hm, i double checked using a simple example and it's working correctly for me (see below). i think it's likely that there is an application error. feel free to adapt my example to reproduce the issue

from langgraph.graph import StateGraph, START
from langgraph.types import interrupt, Command
from langgraph.checkpoint.memory import MemorySaver
from typing import TypedDict


class State(TypedDict):
    foo: str

def my_node(state: State):
    value = interrupt(f"Provide provide a new value. Previous value is: {state['foo']}")
    return {"foo": value}

checkpointer = MemorySaver()
graph = StateGraph(State).add_node(my_node).add_edge(START, "my_node").add_edge("my_node", "my_node").compile(checkpointer=checkpointer)
config = {"configurable": {"thread_id": "1"}}

for chunk in graph.stream({"foo": ""}, config):
    print(chunk)

for chunk in graph.stream(Command(resume="foo"), config):
    print(chunk)

for chunk in graph.stream(Command(resume="bar"), config):
    print(chunk)

[Saisiva123]

@vbarda Can I know the version you are using, please?

[Saisiva123]

Also, I tried your example as well, it's working as expected. I think there is some issue with Langgraph Studio, but not sure.

=> I see the interrupt value in the langsmith that is showing the updated value correctly.

=> But at the same time in the Langgraph Studio, I see the same old message.

Not sure whats happening on why Langsmith and Langgraph are showing different values

[vbarda]

I am using latest version of LangGraph (0.2.69). I checked the studio, and it behaves as expected for me using the example i provided above. I would suggest modifying the code example to try and reproduce the issue